How to output the dimensions of a list in python

The dimensions of the output list in python can be implemented using numpy:

import numpy as np
a = [[1,2],[3,4]]
print(np.array(a).shape)

Extension:

reshape&resize&shape to change the array dimension

reshape function: does not change the original array dimension, has a return value
resize function: directly changes the original array dimension, no return value
shape attribute: directly changes the original array dimension

>>> import numpy as np
>>> a=np.arange(12)
>>> a
array([ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11])
>>> a.reshape(2,6) 
array([[ 0,  1,  2,  3,  4,  5],
       [ 6,  7,  8,  9, 10, 11]])
>>> a
array([ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11])
>>> a.reshape(2,3,2)  
array([[[ 0,  1],  
        [ 2,  3],
        [ 4,  5]],

       [[ 6,  7],
        [ 8,  9],
        [10, 11]]])
>>> a.resize(2,6)
>>> a
>>> array([[ 0,  1,  2,  3,  4,  5],
       [ 6,  7,  8,  9, 10, 11]])
>>> a.shape=(2,6)
>>> a
array([[ 0,  1,  2,  3,  4,  5],
       [ 6,  7,  8,  9, 10, 11]])
>>> a.shape=(2,3,2)
>>> a
array([[[ 0,  1],
        [ 2,  3],
        [ 4,  5]],

       [[ 6,  7],
        [ 8,  9],
        [10, 11]]])
>>>

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